I don't think changes will be real drastic....
I think we'll be moving more along the lines of what's popping up today.... Brusless will be mainstream... Lithium type batteries will replace NiMh or NiCd.... High end radio's will no longer be on the 72mhz band....
I'd love to see true pneumatic tires... No more inserts... Adjust air pressure to suit the surface and conditions....